New Caledonian crows are reported to have impressive pandanus-tool manufacture abilities. These claims are based on an extensive artefact record. However, inferring behavioural and cognitive abilities without direct observation of tool manufacture is problematic. Here we report (and document on video) direct observations of a crow making and using stepped pandanus tools at Pic Ningua. We observed (1) a bias for making tools on left edges consistent with that previously found at the site, (2) faithful manufacture of a stepped design with high overall congruence in the shapes of tools, (3) the use of convergent rips to first form the tapered end working away from the trunk then the wide end working towards the trunk, (4) appropriate functional use of stepped tools by use of the leaf-edge barbs to hook food from holes, and (5) consistent holding of tools on the left side of its head when using them. Our observations verify most of the claims based on the artefact record, but the crow’s exact manufacture technique was slightly different to that inferred previously.
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We thank Christophe Lambert for permission to work in the Pic Ningua Botanical Reserve, the Société Le Nickel mining company for permission to use their access road to the peak, and Etienne DuTailly for accommodation in Nouméa. Megan Wishart made helpful comments on earlier drafts of the manuscript. This research was funded by a grant from the Emerging Research Fund at the University of Auckland. The work presented here complies with the laws of New Caledonia.
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Hunt, G.R., Gray, R.D. Direct observations of pandanus-tool manufacture and use by a New Caledonian crow (Corvus moneduloides). Anim Cogn 7, 114–120 (2004) doi:10.1007/s10071-003-0200-0
- New Caledonian crow
- Pandanus-tool manufacture and use